Base member of a portable lift system



FIG. 1 is a perspective view of a base member of a portable lift system showing my new design;

FIG. 2 is a left elevational view thereof;

FIG. 3 is a right elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a back elevational view thereof; and,

FIG. 6 is a top plan view thereof.

The broken line showing in the figures is for the purpose of illustrating environment and forms no part of the claimed design. 

CLAIM The ornamental design for a base member of a portable lift system, as shown and described. 